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**boromir** A spring is attached to a block, mass m, on a frictionless ramp. Let $\displaystyle {\theta}$ be the angle the plane makes with the horizontal. Assume the spring has unstreched length t and constant k.

1) establish the forces acting on the block. I got normal reation, weight and the restoring force.

2) Find L,the length the spring streches to hold the block in equlibrium. I got $\displaystyle F-mgsin{\theta }=0$ so by hooke's law $\displaystyle L=mgsin{\theta }$ but the answer said I needed to add t. Can anyone explain why?